Ingot-mold.



S. E. HITT & J. I. PEYTON.

INGOT MOLD.

APPLICATION FILED NOV; 29, 1916- l ,230,4:05 Patented June 19, 1917.

WITNESSES lNVENj ORS:

W676i? 4% Q. 4% Q ;Q M w z States,

UNITED STATES PATENT OFFICE.

. SAMUEL E. HITT, OF ELYRIA, OHIO, AND JOSEPH I. PEYTON,

SYLVANIA.

OF JOHNSTOWN, PENN- INGOT-MOLD.

Specification of Letters Patent.

Patented June 19, 1917.

To all whom it may concern:

Be it known that we, SAMUEL E. Hrr'r and Josnrn -I. Pny'roN, citizens ofthe United andresidents, respectively, of Elyria, in the county ofLorain and State of Ohio, and of Johnstown, in the county of Cambria andState of Pennsylvania, have invented certain new and useful Improvements in Ingot-Molds, of which the following is a specification.

This invention relates to improvements in ingot molds and is for thepurpose of overcoming certain diliiculties encountered in themanufacture of our previous inven-' tions claimed in UnitedStatesPatents Nos. 1,139,219 and 1,139,284, issued May 11th, 1915,Canadian Patents No. 162,723, issued May 25th, 1915, and No. 162,873,issued June 1st, 1915, and British Patent No].

12,047/15, (under international convention) date claimed, 22nd August,1914. v In the ingot mold with vacuum chamber as previously designed,the inner wall'be-' coming red hot and the outer-wall remainingcomparatively cold, the difference of temperature is so great as tocause fissures in the casting, causing loss of Vacuum, and it istherefore an object of this invention to provide an expansive outer wallfor the vacuum chamber to overcome thisidiflioulty.-

In our previous invention, some diliiculty; was encountered in moldingthe large heavy ingot molds with the vacuum chamber in the top walls, soit is a further object of our present invention to make the upperportion of the ingot mold containing the vacuum chamber separate fromthe body of the mold. 1

A further object of our invention is to provide a covering for the topof the vacuum head, to protect it from spill when the ingot is cast.

A further object of the present invention is to provide a bettercovering for the air exhausting valve.

In the accompanying drawings: Figure 1 is a central vertical section ofthe vacuum head, showing a portion of the in ot mold body. Fig. 2 is ahalf plan and ha f section on line a: m of Fig. 1. Fig. 3 is a frontview of the vacuum head placed on the mold body ready for the cast. l v

Referring to the drawings, 1 indicates the mold body, 2 the upperportion, of the moldv or head-, containing the vacuum chamber The joint4, between the head 2 and the mold back of the va ve inclosure. edges ofthe front 25 and sides 26 are tapered 1, may beplaned true or left roughand filled with clay or other refractory packing. The joint t'has noinfluence on the casting of the ingot the mold, but facilitates castingof the head 2 and also makes it possible to cast the head 2 in denseriron than the body 1 or in quite different material as caststeel. Thehead 2 constitutes the top of the mold and" consists of an annularhollow ring around the top of the ingot to be cast, and has'an innerwall 5, bottom 6, top 7, and outer wall 8, partly or wholly corrugatedas at 9, to compensate for unequal expansion between the inner and outerwalls. It is desirable to have the inner wall5 as thin as possible, sothat it will come up to a red heat immediately when the assembled moldis poured full, but on the other hand, the inner wall 5 must be thickenough to Withstand anumber of casts.- The outer wall 8 is necessarilythinner than the inner wall 5 on account of the corrugations 9, so thatthe top Wall 7 is tapered to make a gradual transition between the innerand outer walls to avoid internal strains when cast. The lower portion10 of the outer wall 8 is tapered for thesame reason. v

. Lugs 11 are for the )urpose of keeping the head 2 central on the ody1.

The cover 17 can thus move up and down with the expansion andcontraction of the vacuum chamber, without breaking the valve box base21.

The valve box 24 has a front 25, two sides 26 and bottom 27. The hood 28and base 21 are made in one iece and form the top and The upper at 29 tofit a like taper of the hood 28. The bottom 27 carries a In 30 and atapered seat 31 for the key 32. T 1e base 21 carries lugs 33 on eitherside'of lug 30, for the purpose of seating the key 32. \Vhcn the valvebox 24 is swung into place, the key 32 holds the lug 80 against the base21 and also drives the box 2% upon against the hood 28 until the taperededges 29 fit snug. Lugs 34 are cast on the box at to facilitatehandling.

The operation of our invention is as follows: Flexible hose is connectedat 16 with an air pump or other means of exhausting the air; valve 15 isopenedand chamber 3 1s exhausted; valve 15 is closed, hose connectionremoved, valve box 24 swung into position and secured with key 32. Theassembled mold is now poured full of molten metal nearly to cover 17,the upper portion or the cast losinga small amount of heat to bring theinner wall 5 up to a red heat. The effect of the vacuum to retain theheat in the head, keeping the upper portion of the cast molten to feedautomatically any pipe or blow hole that had a tendency to form in theingot being cast, is the same as already described in our previouspatents. The inner wall 5 coming to a read heat so quickly, expandsconsiderably, while the outer wall 8 of the vacuum chamber 3 is stillquite cold. The corrugations 9 of the outer wall 8 will thereforestretch like a spring to compensate for the unequal expansion and willremain under tension. as long as there is an appreciable difierence intemperature between the inner and outer walls. V] hen the ingotsolidifies and the ingot and mold cool oil and become cold, thetemperatures are again equalized and the corrugations 9 assume theirnormal shape. This spring effect of the outer wall 8 will relieveexcessive strains and protect the walls of the chamber from cracking.

()ur present invention thus provides a vacuum head capable of repeateduse, male ing it more practical for general introduction and reducingthe cost per ton of ingot cast over our previous inventions.

We have illustrated and described pre ferred constructions, but changescould be made within the spirit and scope of the invention.

We claim:

1. An ingot mold, a removable head therefor constituting a vacuumchamber, and having means of compensating the difierence of expansionand contraction between the inner and outer walls of the said vacuumchamber.

2. An ingot mold, a removable head therefor constituting a vacuumchamber with corrugated outer wall, an aperture in said chamber andmeans of closure of the said aperture.

3. An ingot mold, a removable head therefor constituting a vacuumchamber with corrugated outer wall, an aperture in said chamber, a valveclosure for said aperture and means for protecting the said valve.

4:. An ingot mold, a removable head theretor constituting a vacuumchamber with corrugated outer wall, an aperture in said chamber, a valveclosure for said aperture, means for protecting the said valve and acover for protecting the top of the said vacuum chamber.

5, An ingot mold, a removable head therefor constituting a vacuumchamber ccrrugated outer wall, an aperture in said chamber, a valveclosure for said aperture, a hooded base 21 secured to the chamberbottom 6, a cover 17 for the vacuum chamber, the said base 21 arrangedfor vertical movement relatively to the said cover 1?.

6. An ingot mold, a removable head there for constituting a vacuumchamber 3 with corrugated outer wall 8, an aperture 12, pipe 14, a valveclosure 15, a hooded base 21 secured to the chamber bottom 6, a cover 17arranged to hold the base 21 in position and to allow for verticalmovement of the said base relatively to the said cover, a valve box 24arranged to fit the base 21 and hood 223 to inclose completely the valve15, and means for holding the said valve box 24 in position.

SAMUEL E. lLlTT.

"Witnesses:

RICHARD Scrrcnz, Harry A. Sononz.

JOSEPH l.

Witnesses:

Joan E. Wannrnsnaw, Green Snrenn'r.

